1. Impregnation of one substance by another to the greatest possible extent. 2. Neutralization, as of an acid by an alkali. 3. That concentration of a dissolved substance that cannot be exceeded. 4. In optics, see saturated color. 5. Filling of all the available sites on an enzyme molecule by its substrate, or on a hemoglobin molecule by oxygen (symbol SO2) or carbon monoxide (symbol SCO). [L. saturatio, fr. saturo, to fill, fr. satis, enough]
secondary s.a technique of nitrous oxide anesthesia consisting of an abrupt curtailment of the oxygen in the inhaled mixture to produce a deep plane of anesthesia, following which oxygen is administered to correct hypoxia.
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